OPEC’s surprise deal to reduce crude production isn’t only supporting oil prices, it’s helping drive gains across commodities and the companies that produce them. The Bloomberg Commodity Index, a measure of returns from 22 raw materials, extended gains after the biggest jump in almost three weeks on Wednesday, when OPEC agreed to cut output for the first time in eight years. The news of the accord weighed on the dollar, increasing the appeal of assets such as copper that are priced in the U.S. currency.

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